Punch



V. KALFUS Feb. 20; 1934.

PUNCH Original Filed June 17, 1931 2 Sheets-Sheet l Patented Feb. 20, 1934 UNITED STATES PATENT OFFICE Application June 17, 1931, Serial No. 545,109 Renewed May 17, 1933 2 Claims.

The invention aims to provide a simple, inexpensive and eflicient punch, by means of which various sheet metal articles may be quickly and easily formed with sharply cut openings, the

device being particularly advantageous for forming new openings in hack-saw blades which have been broken at or near the original openings.

With the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, description being accomplished by reference to the accompanying drawings.

Fig. 1 is a perspective view showing a punch embodying a plurality of punches.

Fig. 2 is a perspective view showing a cap block tilted upwardly from the base block.

Fig. 3 is a longitudinal sectional view on line 3-3 of Fig. 1.

Figs. 4 and 5 are transverse sectional views on lines 44 and 55 of Fig. 3.

Fig. 6 is a fragmentary edge view partly broken away and in section showing a slight variation.

Fig. 7 is a small perspective view illustrating a construction which may be followed when using small number of punches, for instance, from one to three.

The structure shown in Figs. 1 to 5 will first be described. In these views, B denotes a rectangular base block preferably cast from iron or steel, said block having a flat upper side 12 and a row of punch-receiving openings 13 which open through said side and also through the bottom of the block. Any or all of these openings may be provided with a hard metal bushing such as denoted at 14 in Figs. 2 and 5. The block B is also provided with another row of punch receiving openings 15 extending from its upper to its lower side and opening into fiat bottomed shallow grooves 16, said grooves being formed in the face 12 and all opening through one longitudinal edge of the block. Two of these grooves are also shown as opening through the opposite ends of the block. Between the grooves 16, the upper face of the block B is provided with gauge-receiving grooves 17 which open through the same longitudinal edge of said block, as said grooves 16. Slidably received in the grooves 1'7 are flat gauge strips 18 whose thickness is greater than the depth of said grooves, said gauge strips having longitudinal slots 19 through which screws 20 pass to hold said gauge strips in adjusted position, the screws being threaded into the base block B and countersunk into the strips 18.

Hack-saw blades and the like to be punched, may be inserted into the grooves 16 and the punches hereinafter described are driven downwardly through them and received in the openings 15. Other metallic strips may be laid upon 00 the flat face 12 of the block B with their edges abutting the inner ends of the gauge strips 18, the latter being adjusted into any desired positions. Other punches may then be driven downwardly through the sheet material into the openings 13 to form the desired openings in said material.

A rectangular cap block C is provided to hold the work either against the face 12 or against the flat bottoms of the grooves 16. This block C is preferably cast from iron or steel and its flat lower side is provided with shallow grooves 21 receiving the upwardly projecting portions of the strips 18. The blockC carries a plurality of vertical punches 22 for co-action with the 76 openings 13, and another plurality of punches 23 for co-action with the openings 15, all of the punches being mounted in a manner hereinafter described.

The cap block C is of less width than the 80 base block B, leaving one edge portion of the latter projecting laterally beyond one edge of the former, as shown more particularly in Figs.

1, 4 and 5. The laterally projecting edge portion of the block B is provided with two integral 86 upstanding lugs 24 spaced inwardly from its ends and abutting the adjacent edge of the cap block C. This edge of the cap block is provided with integral laterally projecting lugs 25 which abut the outer sides of the lugs 24. Hence, sliding noof the cap block C toward the lugs 24 is limited and endwise sliding of said cap block is prevented. The lugs 24 and 25 co-act in roughly positioning the blocks B and C relatively, and

to then secure them in accurate relatively set h position, vertical pins 27 are provided for passage through openings 28 in the cap block C and openings 29 in the base block B. When the pins 2'7 are inserted into the openings 28' and 29, it

is insured that the various punches shall be alined with their co-acting openings to cleanly cut the work when said punches are downwardly driven with a hammer.

If desired, as seen in Fig. 6, screws 30 may be threaded through the lugs 25 and received at their inner ends in recesses 31 formed in the lugs 24. When this construction is used, the blocks B and C remain connected with each other but may readily be disconnected if desired.

All of the punches 22 and 23 are duplicates with the exception of size, and they are all mounted in the same way, so that a description of one punch and its mounting will sufiice for all. In following this description, reference is 5 made more particularly to Figs. 3, 4 and 5. A

vertical opening is provided in the cap block C,

said opening having a relatively small lower end 32, a comparatively large upper end 33, and a shoulder 34 at the juncture of said small and large ends. The punch is provided with a small lower end 35, with a larger upper end 36 and with a still larger head 37 between said upper and lower ends. The lower end 35 is slidable through the small end 32 of the punch-guiding opening, the head 37 is slidable in the large end 33 of said opening, and the upper end 36 of the punch projects above the block C. A retaining plate 38 is provided for all of the punches 22 and a similar plate 39 is employed for the punches 23. For each punch, each plate is formed with an opening 40 through which the end 36 passes slidably, said opening 40 being of less diameter than the underlying head 37. It will thus be seen that the various punches are 25, mounted for free sliding movement and that their ascent and descent are limited. Preferably, the plates 38 and 39 are snugly received in grooves 41 formed in the upper side of the cap block C, said plates being secured to said 3 block by screws or the like 42.

Any or all of the punches may be provided with driving caps 43 which may either rest temporarily upon them or may be secured in place.

To form openings in hack-saw blades or the 5v like, they are inserted into the grooves 16 as above described, and the punches 23 are operated, whereas the punches 22 and openings 13 come into play when punching other sheet metal strips and the like, the gauges 18 being adjust ed as may be required.

' In Fig. '7, I have shown asmaller structure.

The formation of the base block B" and the cap block C" may embody details such as those above described, but a different arrangement of lugs is provided instead of following that shown for instance in Fig. 1'. While the ends of the cap block C are provided with lateral lugs 25' corresponding with the lugs 25, the base block is provided with only one lug 24 which is straddled by said lugs 25'. Co-acting with the lugs in relatively positioning the base and cap blocks, are pins 27 similar to the pins 27 above described.

The construction disclosed in Fig. 7 is used in the smaller punches for either performing lighter work or having a lesser number of punch size varieties.

I claim:-

1. A punch comprising a rectangular base block having a fiat upper work-supporting face and provided with a punch-receiving opening which opens through said upper face, a cap block overlying said base block and adapted to hold the work against said work-supporting face, said cap block being of less width than said base block, leaving one edge portion of the latter projecting beyond one edge of the cap block, lugs integral with said one edge of said cap block and said projecting edge portion of said base block, said lugs having abutting faces holding said cap block against sliding relative to said base in either of two opposed directions, said one edge of said cap block abutting at least one base-carried 'lug to hold the cap block against sliding in a direction at right angles to the aforesaid directions, and a punch carried by said cap block for reception in said punch-receiving opening.

2. A punch comprising a base block having a punch-receiving opening, a cap block having a punch for reception in said opening, the two blocks being provided with vertical openings adapted to aline when the punch and punch-receiving opening are alined, co-acting lugs on the two blocks instrumental in roughly positioning said blocks relatively, and pins extraneous to both blocks and adapted for snug insertion into said openings of the two blocks to accurately position said blocks with the punch and punch-receiving opening alined.

VICTOR KALFUS. 

